2. Select. Encourage your child to pick images that s/he loves. For this project, it is a good idea to select three small images for every one big image.
8. Assemble. Glue your hearts to your cards and write on them as you please. If you want to embellish your envelopes, use the scraps. [Consider postcards if your child just wants to sign his/her name and be done!]
For younger children, the shape should be larger, so that more pictures show up in each shape.
If your child only wants to make one collage and you have a big class/group to give Valentines to, color photocopy the collage before cutting it.
This project can "grow up" into other things. Here is this method using art paper in a specific color scheme. These hearts adorned wedding program covers.